function strNumDiscode(str) {
	str = str.replace(/&forall;/g, '∀');
	str = str.replace(/&part;/g, '∂');
	str = str.replace(/&exist;/g, '∃');
	str = str.replace(/&empty;/g, '∅');
	str = str.replace(/&nabla;/g, '∇');
	str = str.replace(/&isin;/g, '∈');
	str = str.replace(/&notin;/g, '∉');
	str = str.replace(/&ni;/g, '∋');
	str = str.replace(/&prod;/g, '∏');
	str = str.replace(/&sum;/g, '∑');
	str = str.replace(/&minus;/g, '−');
	str = str.replace(/&lowast;/g, '∗');
	str = str.replace(/&radic;/g, '√');
	str = str.replace(/&prop;/g, '∝');
	str = str.replace(/&infin;/g, '∞');
	str = str.replace(/&ang;/g, '∠');
	str = str.replace(/&and;/g, '∧');
	str = str.replace(/&or;/g, '∨');
	str = str.replace(/&cap;/g, '∩');
	str = str.replace(/&cup;/g, '∪');
	str = str.replace(/&int;/g, '∫');
	str = str.replace(/&there4;/g, '∴');
	str = str.replace(/&sim;/g, '∼');
	str = str.replace(/&cong;/g, '≅');
	str = str.replace(/&asymp;/g, '≈');
	str = str.replace(/&ne;/g, '≠');
	str = str.replace(/&le;/g, '≤');
	str = str.replace(/&ge;/g, '≥');
	str = str.replace(/&sub;/g, '⊂');
	str = str.replace(/&sup;/g, '⊃');
	str = str.replace(/&nsub;/g, '⊄');
	str = str.replace(/&sube;/g, '⊆');
	str = str.replace(/&supe;/g, '⊇');
	str = str.replace(/&oplus;/g, '⊕');
	str = str.replace(/&otimes;/g, '⊗');
	str = str.replace(/&perp;/g, '⊥');
	str = str.replace(/&sdot;/g, '⋅');
	return str;
}

// HTML 支持的希腊字母
function strGreeceDiscode(str) {
	str = str.replace(/&Alpha;/g, 'Α');
	str = str.replace(/&Beta;/g, 'Β');
	str = str.replace(/&Gamma;/g, 'Γ');
	str = str.replace(/&Delta;/g, 'Δ');
	str = str.replace(/&Epsilon;/g, 'Ε');
	str = str.replace(/&Zeta;/g, 'Ζ');
	str = str.replace(/&Eta;/g, 'Η');
	str = str.replace(/&Theta;/g, 'Θ');
	str = str.replace(/&Iota;/g, 'Ι');
	str = str.replace(/&Kappa;/g, 'Κ');
	str = str.replace(/&Lambda;/g, 'Λ');
	str = str.replace(/&Mu;/g, 'Μ');
	str = str.replace(/&Nu;/g, 'Ν');
	str = str.replace(/&Xi;/g, 'Ν');
	str = str.replace(/&Omicron;/g, 'Ο');
	str = str.replace(/&Pi;/g, 'Π');
	str = str.replace(/&Rho;/g, 'Ρ');
	str = str.replace(/&Sigma;/g, 'Σ');
	str = str.replace(/&Tau;/g, 'Τ');
	str = str.replace(/&Upsilon;/g, 'Υ');
	str = str.replace(/&Phi;/g, 'Φ');
	str = str.replace(/&Chi;/g, 'Χ');
	str = str.replace(/&Psi;/g, 'Ψ');
	str = str.replace(/&Omega;/g, 'Ω');

	str = str.replace(/&alpha;/g, 'α');
	str = str.replace(/&beta;/g, 'β');
	str = str.replace(/&gamma;/g, 'γ');
	str = str.replace(/&delta;/g, 'δ');
	str = str.replace(/&epsilon;/g, 'ε');
	str = str.replace(/&zeta;/g, 'ζ');
	str = str.replace(/&eta;/g, 'η');
	str = str.replace(/&theta;/g, 'θ');
	str = str.replace(/&iota;/g, 'ι');
	str = str.replace(/&kappa;/g, 'κ');
	str = str.replace(/&lambda;/g, 'λ');
	str = str.replace(/&mu;/g, 'μ');
	str = str.replace(/&nu;/g, 'ν');
	str = str.replace(/&xi;/g, 'ξ');
	str = str.replace(/&omicron;/g, 'ο');
	str = str.replace(/&pi;/g, 'π');
	str = str.replace(/&rho;/g, 'ρ');
	str = str.replace(/&sigmaf;/g, 'ς');
	str = str.replace(/&sigma;/g, 'σ');
	str = str.replace(/&tau;/g, 'τ');
	str = str.replace(/&upsilon;/g, 'υ');
	str = str.replace(/&phi;/g, 'φ');
	str = str.replace(/&chi;/g, 'χ');
	str = str.replace(/&psi;/g, 'ψ');
	str = str.replace(/&omega;/g, 'ω');
	str = str.replace(/&thetasym;/g, 'ϑ');
	str = str.replace(/&upsih;/g, 'ϒ');
	str = str.replace(/&piv;/g, 'ϖ');
	str = str.replace(/&middot;/g, '·');
	return str;
}

function strcharacterDiscode(str) {
	// 加入常用解析
	str = str.replace(/&nbsp;/g, ' ');
	str = str.replace(/&ensp;/g, ' ');
	str = str.replace(/&emsp;/g, '　');
	str = str.replace(/&quot;/g, "'");
	str = str.replace(/&amp;/g, '&');
	str = str.replace(/&lt;/g, '<');
	str = str.replace(/&gt;/g, '>');
	str = str.replace(/&#8226;/g, '•');

	return str;
}

// HTML 支持的其他实体
function strOtherDiscode(str) {
	str = str.replace(/&OElig;/g, 'Œ');
	str = str.replace(/&oelig;/g, 'œ');
	str = str.replace(/&Scaron;/g, 'Š');
	str = str.replace(/&scaron;/g, 'š');
	str = str.replace(/&Yuml;/g, 'Ÿ');
	str = str.replace(/&fnof;/g, 'ƒ');
	str = str.replace(/&circ;/g, 'ˆ');
	str = str.replace(/&tilde;/g, '˜');
	str = str.replace(/&ensp;/g, '');
	str = str.replace(/&emsp;/g, '');
	str = str.replace(/&thinsp;/g, '');
	str = str.replace(/&zwnj;/g, '');
	str = str.replace(/&zwj;/g, '');
	str = str.replace(/&lrm;/g, '');
	str = str.replace(/&rlm;/g, '');
	str = str.replace(/&ndash;/g, '–');
	str = str.replace(/&mdash;/g, '—');
	str = str.replace(/&lsquo;/g, '‘');
	str = str.replace(/&rsquo;/g, '’');
	str = str.replace(/&sbquo;/g, '‚');
	str = str.replace(/&ldquo;/g, '“');
	str = str.replace(/&rdquo;/g, '”');
	str = str.replace(/&bdquo;/g, '„');
	str = str.replace(/&dagger;/g, '†');
	str = str.replace(/&Dagger;/g, '‡');
	str = str.replace(/&bull;/g, '•');
	str = str.replace(/&hellip;/g, '…');
	str = str.replace(/&permil;/g, '‰');
	str = str.replace(/&prime;/g, '′');
	str = str.replace(/&Prime;/g, '″');
	str = str.replace(/&lsaquo;/g, '‹');
	str = str.replace(/&rsaquo;/g, '›');
	str = str.replace(/&oline;/g, '‾');
	str = str.replace(/&euro;/g, '€');
	str = str.replace(/&trade;/g, '™');

	str = str.replace(/&larr;/g, '←');
	str = str.replace(/&uarr;/g, '↑');
	str = str.replace(/&rarr;/g, '→');
	str = str.replace(/&darr;/g, '↓');
	str = str.replace(/&harr;/g, '↔');
	str = str.replace(/&crarr;/g, '↵');
	str = str.replace(/&lceil;/g, '⌈');
	str = str.replace(/&rceil;/g, '⌉');

	str = str.replace(/&lfloor;/g, '⌊');
	str = str.replace(/&rfloor;/g, '⌋');
	str = str.replace(/&loz;/g, '◊');
	str = str.replace(/&spades;/g, '♠');
	str = str.replace(/&clubs;/g, '♣');
	str = str.replace(/&hearts;/g, '♥');

	str = str.replace(/&diams;/g, '♦');
	str = str.replace(/&#39;/g, "'");
	return str;
}

function strDiscode(str) {
	if (!str) return;
	str = strNumDiscode(str);
	str = strGreeceDiscode(str);
	str = strcharacterDiscode(str);
	str = strOtherDiscode(str);
	return str;
}

function urlToHttpUrl(url, domain) {
	if (/^\/\//.test(url)) {
		return `https:${url}`;
	} else if (/^\//.test(url)) {
		return `https://${domain}${url}`;
	}
	return url;
}

export default {
	strDiscode,
	urlToHttpUrl,
};